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. Author manuscript; available in PMC: 2022 Aug 11.
Published in final edited form as: Chem Rev. 2021 Jun 16;121(15):9359–9406. doi: 10.1021/acs.chemrev.0c01096

Scheme 72.

Scheme 72.

Approaches to Carbonyl-Olefin Ring-Closing Metathesis Relying on Tropylium Cations, Iodine, and AuCl3 as Lewis Acid Catalysts for the Formation of Polyaromatic Hydrocarbons by Nguyen and Lin